The phrase "about to accede" is correct and usable in written English.
It can be used when indicating that someone is on the verge of agreeing to or formally joining something, such as a treaty or organization.
Example: "The country is about to accede to the international agreement, marking a significant step in its diplomatic relations."
Alternatives: "on the verge of joining" or "ready to agree to".
Mr. Obama is, after all, about to accede to an office in which one of the bedrock and least fettered powers is that of granting pardons and reprieves.
As The Economist went to press, a reluctant Mr Bush seemed about to accede to those pleas.Africa has, to put it mildly, a lot of problems; even a hyperpower cannot solve them all.
"We have not heard from Matthew Guy about his plan to fund public education in Victoria and that, I think, is what parents want to know about, not his plan to accede to the rightwing conservative voices within the Liberal party and come up with another peripheral policy," Peace told Guardian Australia.
At about the same time, Switzerland gradually began to accede to international pressure to allow greater scrutiny of its famously secretive banking sector, amid growing concerns about money-laundering and the financing of terrorist groups.
The international community spent years engaged in dilatory debates about Palestine's statehood and its ability to accede to the ICC statute, while violations committed by the Israeli military against Palestinian civilians have continued and impunity has been the norm.
The crisis over the two-month extension wasn't really about the payroll tax at all; it was about the hurt feelings of bumptious House members having to accede to a deal driven by the Senate and the White House.
However, appearing before the media alongside Robert Gates, his American counterpart, Dr Fox, talking about a possible Kandahar move, said: "It is highly unlikely we would want to accede to that particular change.
Some Republican members appear ready to accede.
He refused to accede to their wishes.
Agreement, it shall make every effort to accede.
(Nobody is talking about leaving the N.C.A.A., but with a gun to its head, it would be forced to accede to looser rules for the major powers).
